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The first scheme is to use the general coding method to realize the preloading technology of the picture. First, create the imgNode element, Then when the method myImage.setSrc is called, a preloaded picture is given to the picture first, and when the picture is loaded, the img element is assigned a value. The second scheme is implemented by using proxy mode. MyImage function is only responsible for creating img elements, proxy function ProxyImage is responsible for setting loading pictures for the picture, and when the picture is really loaded, myImage.setSrc method in myImage is called to set the path of the picture. The advantages and disadvantages between them are as follows:3. Some classes, such as the core trading engine of the exchange, control the trading process. If multiple classes can be created, the system will be completely messed up. (For example, if there are multiple commanders in an army who command at the same time, there will definitely be a mess), so only by using the singleton mode can the core transaction server independently control the whole process.哼，确实要胡家出银子，他这就跟他讨要。Abstract class or interface. Then program based on abstract classes or interfaces不过，现在已经有很多人需要深入的报告了。还有，赶快交稿，《倚天屠龙记》的稿子一个字都不能少。描写着聚集不良帮派组织的SWORD地区，卷起了激烈的争斗以及其隐藏背后真实的成人世界。